net: macb: timer adjust mode is not supported

net: macb: timer adjust mode is not supported

The ptp portion of this driver controls the tsu's timer using the
controls for "increment mode", which is not compatible with the hardware
trying to control it via the gem_tsu_inc_ctrl and gem_tsu_ms inputs in
"timer adjust mode". Abort probe if the property signalling that the
relevant signals have been wired up is present.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260325-facebook-chop-cf792c53f1da@spud
Signed-off-by: Jakub Kicinski <kuba@kernel.org>